Ok I'm new to all this but I remembered something in the maintenance book I downloaded to my nook. It states- "Shimano 110 speed cog sets will fit on either type of hub body offered by shimano, But the 10 speed only body found on Dur-Ace and Ultegra freehubs wont accept 8-spee, 9-speed or any sram or aftermarket cog sets." Following the link provided by mrrabbit that is a 10-speed hub. Hope this helps.